Sony PCV-RX790G System Reference Manual page 24

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VAIO Digital Studio System Reference Manual
VGA Monitor Port
The monitor port is a standard 15-pin female high-density VGA-type port
located on the AGP plug-in card.
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15
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6
Mic, Line In, and Headphones Jacks
The microphone, line in, and headphones jacks are physically identical,
but have different connections. They are standard 3.5 mm stereo
mini-jacks.
Headphones
Connector
Headphones
Mic
Line In
5
1
Line In Mic
Description
1.0 Vrms (typical).
Electret condenser microphone input.
1.0 Vrms (typical), 10 Kohm impedance.